4.1 Cabernet Sauvignon

Cabernet Sauvignon is one of the world's most widely planted and recognizable black grape varieties, and WSET Level 2 treats it as the benchmark for a full-bodied, high-tannin red. Understanding its structure and its handful of signature growing regions is essential for the exam's principal-grape-variety questions.

Grape Characteristics

Cabernet Sauvignon is a thick-skinned grape, and thick skins mean high levels of tannin and colour compounds extracted during winemaking. On the vine it ripens relatively late, so it thrives where the growing season is warm enough to bring it to full ripeness before autumn rain or cold arrives. It is also a naturally vigorous, small-berried variety, and small berries have a higher skin-to-juice ratio, which further concentrates colour, tannin, and flavour in the finished wine.

In the glass, Cabernet Sauvignon typically shows:

Because its tannin and acid levels are naturally high, Cabernet Sauvignon pairs exceptionally well with oak ageing. Time in oak barrels adds flavours of vanilla, toast, cedar, or smoke and helps soften the wine's structure over years of bottle age, which is why Cabernet Sauvignon is closely associated with wines built for medium- to long-term cellaring. New oak, particularly from French or American forests, is often chosen deliberately by winemakers seeking extra structure and spice to match the grape's own intensity.

Cabernet Sauvignon is also a natural blending partner. Its firm tannin and dark fruit combine well with softer, earlier-ripening varieties such as Merlot, which fills out the mid-palate, and Cabernet Franc, which adds aromatic lift and a touch of herbaceous complexity. This blending tradition began in Bordeaux and has been copied by winemakers worldwide, to the point that "Bordeaux blend" is now used as a general style descriptor even for wines made far from France.

Bordeaux: The Historic Home

Cabernet Sauvignon reaches one of its finest expressions on the Left Bank of Bordeaux, in the gravelly soils of the Médoc and Haut-Médoc. Gravel drains well and retains daytime heat, helping this late-ripening grape reach full maturity in Bordeaux's relatively cool maritime climate. Within the Haut-Médoc, the villages of Pauillac and Margaux produce some of the most sought-after Cabernet-based wines in the world, prized for concentrated blackcurrant fruit, firm tannin, and long ageing potential; these wines are almost always blends, with Cabernet Sauvignon as the majority grape supported by Merlot, Cabernet Franc, and small amounts of Petit Verdot. Cabernet Sauvignon is also important, though usually in a supporting role alongside Sauvignon Blanc, Sémillon, and other reds, in the Graves and Pessac-Léognan appellations, both of which are unusual in producing serious red and white wine from the same broad area. At a simpler, everyday-drinking level, blended Cabernet appears in the broad regional appellation Pays d'Oc in southern France, usually labelled with the grape name and offering soft, fruity, easy-drinking styles at accessible prices.

California

In warmer California, Cabernet Sauvignon ripens fully and reliably, producing riper, richer wines than cool Bordeaux. Napa Valley is the benchmark American region, and within it the sub-districts of Oakville, Rutherford, and Calistoga are especially prized for concentrated, structured Cabernet Sauvignon, often aged in a high proportion of new oak and commanding premium prices. Neighbouring Sonoma also produces excellent, if generally slightly less powerful, examples, often at somewhat more accessible price points. California Cabernet typically shows riper black fruit, higher alcohol, and softer, more approachable tannins on release than its Bordeaux counterpart, reflecting the state's warmer, sunnier, and more consistent growing season.

Chile

Chile's warm, dry climate and irrigated vineyards suit Cabernet Sauvignon well, and the grape is the country's single most important red variety by volume and reputation. The Maipo Valley, close to Santiago, is historically the country's most famous Cabernet region, known for structured wines with blackcurrant fruit and a characteristic minty or eucalyptus note from nearby trees. Colchagua Valley, further south and generally warmer at lower elevations, produces riper, fuller-bodied Cabernet, often blended with Carmenère, Chile's own specialty grape, to add plush texture and spice.

Australia, South Africa, and New Zealand

Coonawarra, in South Australia, is celebrated for Cabernet Sauvignon grown on distinctive red terra rossa soil over limestone; its cooler nights preserve acidity and often produce a signature eucalyptus/mint character alongside blackcurrant fruit. Margaret River, in Western Australia, benefits from a moderating maritime climate and produces elegant, structured Cabernet Sauvignon frequently compared to Bordeaux in style, with fine tannin and restrained fruit. In South Africa, Stellenbosch is the leading Cabernet Sauvignon region, with mountain-influenced sites giving ripe fruit balanced by firm tannin. New Zealand's warmest red-wine region, Hawke's Bay, on the North Island, also produces well-regarded Cabernet Sauvignon and Cabernet-based blends, particularly from its free-draining Gimblett Gravels sub-district, which shares gravel soils conceptually similar to the Médoc.

Exam Focus

For Level 2 purposes, remember Cabernet Sauvignon as the high-tannin, high-acid, full-bodied blackcurrant grape that loves oak and blending, and remember its core regions by climate logic: cooler Bordeaux and Coonawarra give firmer, sometimes herbaceous or minty styles, while warmer Napa, Colchagua, and Stellenbosch give riper, richer, more fruit-forward styles. If a question mentions blackcurrant fruit, high tannin, and gravel soils together, Cabernet Sauvignon and the Médoc are the most likely answer.